my Honda Civic's check engine light is on but car runs fine what should I do

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to reset the system.

2. Retrieve and Address Codes

• Connect the OBD-II scanner to the vehicle’s diagnostic port.
• Turn the ignition to the ON position without starting the engine.
• Follow the scanner's instructions to read and save any diagnostic trouble codes.
• Note the codes for reference and turn off the ignition.

3. Inspect and Reset

• Reconnect the negative battery terminal after recording the codes.
• If the codes are related to a minor issue (e.g., loose gas cap), resolve it (tighten or replace the gas cap).
• Clear the codes using the OBD-II scanner and turn the ignition back to the ON position to verify that the check engine light remains off.

4. Monitor

• Drive the vehicle normally for a few days to see if the check engine light reappears.
• If the light returns, further diagnostics may be necessary based on the new codes retrieved.